Facebook Pony Maker
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Now although this one is not as good as General Zoi's pony maker on Deviant Art in my opinion, I still gave it a shot, there is a wide variety of things you can do that couldn't be done on Zoi's and vice versa. So if you have a Facebook give it a shot anyway. If you want I can upload the one from there and the one from Zoi's creator for a comparison.